EPC1441 datasheet(7/36 Pages) ETC1

7 / 36 page

Altera Corporation

Configuration Devices for SRAM-Based LUT Devices Data Sheet

Device

Configuration

The control signals for configuration devices—nCS, OE, and DCLK—

interface directly with APEX II, APEX 20K, Mercury, ACEX 1K, and FLEX

device control signals. All APEX II, APEX 20K, Mercury, ACEX 1K, and

FLEX devices can be configured by a configuration device without

requiring an external intelligent controller.

The configuration device’s OE and nCS pins control the tri-state buffer on

the DATA output pin, and enable the address counter (and the oscillator in

EPC4, EPC 8, EPC16, EPC2, EPC1, and EPC1441 devices). When OE is

driven low, the configuration device resets the address counter and tri-

states its DATA pin. The nCS pin controls the output of the configuration

device. If nCS is held high after the OE reset pulse, the counter is disabled

and the DATA output pin is tri-stated. When nCS is driven low, the counter

and DATA output pin are enabled. When OE is driven low again, the

address counter is reset and the DATA output pin is tri-stated, regardless

of the state of nCS.

The EPC4, EPC8, EPC16, EPC2, EPC1, and EPC1441 devices

determine the operation mode and whether the APEX 20K,

Mercury, ACEX 1K, FLEX 10K, FLEX 8000, or FLEX 6000

protocols should be used when OE is driven high.

When the configuration device has driven out all of its data and has

driven nCASC low, the device tri-states the DATA pin to avoid contention

with other configuration devices.

The EPC2 device allows the user to initiate configuration of the PLD via

an additional pin, nINIT_CONF, that can be tied to the nCONFIG pin of the

PLD(s) to be configured. A JTAG instruction causes the EPC4, EPC8,

EPC16, and EPC2 device to drive nINIT_CONF low, which in turn pulls

nCONFIG

low. The EPC4, EPC8, EPC16, and EPC2 device then drives

nINIT_CONF

high to start configuration. When the JTAG state machine

exits this state, nINIT_CONF releases nCONFIG and configuration is

initiated.

An EPC4, EPC8, EPC16, and EPC2 device can be programmed

with a POF generated for an EPC1 or EPC1441 device, however,

an EPC2 device cannot configure FLEX 6000 or FLEX 8000

devices. An EPC1 device can be programmed using a POF

generated for an EPC1441 device.

EPC1441 데이터시트(PDF) 7 Page - List of Unclassifed Manufacturers